... 3. Superior product 4. Function test, RoHS, UL Hangzhou Singo Tech Co. Ltd, located in West Lake technology park in Hangzhou Zhejiang province ... Financial Center. Founded in 2000, our company is a high-tech modern enterprise, focusing on design, manufacture and marketing service ... touchups and production.If you have specifical requirements,need brand-new disigning or touch-ups on existing works,we can ...